devel-envs.sh: also add the builddir/bin to the PATH
devel-envs.sh: also add the builddir/bin to the PATH

so it's easier to call poclcc

Oblomov/pocl,rjodin/pocl,pocl/pocl,rjodin/pocl,franz/pocl,Oblomov/pocl,franz/pocl,jrprice/pocl,pocl/pocl,pocl/pocl,rjodin/pocl,Oblomov/pocl,jrprice/pocl,franz/pocl,franz/pocl,rjodin/pocl,pocl/pocl,jrprice/pocl,franz/pocl,jrprice/pocl,Oblomov/pocl,pocl/pocl,Oblomov/pocl